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x in (-oo:+oo)
-9 = 5*x-4*x-2 // - 5*x-4*x-2
2-(-4*x)-(5*x)-9 = 0
4*x-5*x-9+2 = 0
-x-7 = 0 // + 7
-x = 7 // * -1
x = -7
x = -7
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